ZIP Code 99643 in Old Harbor, AK

Data Last Updated: March 1, 2026
City:Old Harbor, Alaska
Borough:Kodiak Island Borough
Timezone:Alaska (GMT -09:00)
Local Time:9:23:04 AM
Population:216 [See All]
Area Code:907
Classification:PO Box
Coordinates:57.2205, -153.3213
Land Area:15.926 sq mi
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In the United States, a county equivalent is a political or administrative subdivision of a state. It has a specific geographic area and some level of governmental authority. The term "county" is used in 47 states. Alaska, Louisiana, and Connecticut have functionally equivalent subdivisions called Boroughs, Parishes, and Planning Regions, respectively. They functionally act like counties by subdividing the state.

99643 - Old Harbor, AK

ZIP Code 99643, Old Harbor

Tribal
LocationKodiak Island County, AK
Area20.6 sq mi
Population216
Households95
PO Boxes1 Low Adoption (1%)
Median Age38.0 years
ZIP CreatedBefore Oct 2004
Key Facts
  • This is a true PO Box only zone where residents have no alternative delivery options from nearby ZIP codes
  • The community has just one named street (Three Saints Ave) plus one named building receiving mail delivery
  • With 82% Native American population, this is a predominantly Alutiiq fishing village on Kodiak Island
  • The post office serves 95 households across 20.6 square miles of island terrain accessible only by boat or plane
  • Only 6 businesses operate here, employing 12 people, with fishing dominating the seasonal economy
  • The PO Box adoption rate of 0.011 indicates the post office serves only local residents, not surrounding areas

Location & Geography

Old Harbor sits on Kodiak Island's southeastern coast, one of Alaska's most isolated communities. The village of 216 residents spreads across 20.6 square miles where the island meets Sitkalidak Strait. Getting here requires a flight from Kodiak or a boat ride—there's no road connection to anywhere else.

Postal Infrastructure

The post office on Three Saints Ave isn't just where people pick up mail. It's the community's connection to the world beyond the island. With IsPOBoxOnlyZone status, residents don't have the option of street delivery from a neighboring ZIP code. Every household, all 95 of them, relies on this building for their mail.

Community Character

Eighty-two percent of residents are Native American, primarily Alutiiq people whose ancestors have fished these waters for thousands of years. The median age of 38 reflects a stable, multigenerational community. With a population-to-household ratio of 2.3, you see mostly nuclear families rather than the extended family compounds common in larger Alaska Native villages.

Economic Profile

The local economy centers on fishing. Median household income stands at $31,250, well below Alaska's state average. Home values average $95,000, reflecting the island's remoteness and limited housing market. Six businesses employ 12 people, but seasonal fishing work dominates the employment picture. When you live on an island with one street and no road out, the post office becomes infrastructure as fundamental as the boat harbor.

Street Name Patterns

Minimal Infrastructure Coastal Alaska Single Street Village

With only Three Saints Ave appearing in postal records, Old Harbor shows the minimal street infrastructure typical of remote Alaska Native villages. The name references Three Saints Bay, site of the first Russian settlement in Alaska (1784). Despite covering over 20 square miles, the village's development concentrates along the coast where boats can land and planes can reach the airstrip.

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Population & Demographics


ZIP Code 99643 has 216 residents and 95 households (average 2.27 persons per household). The median age is 38.0 years, slightly older than the state (35.6) and about the same as the nation (38.8). The gender split is 55.1% male and 44.9% female, which is higher than the national male share (49.1%), making this a male-majority area. Largest groups are American Indian & Alaska Native (82.4%, much higher than the state average of 15.2% and well above the national average of 1.1%) and White (10.2%, much lower than the state average of 59.4% and well below the national average of 61.6%); Hispanic or Latino residents make up 2.8%, which is much lower than the national average (18.7%), and American Indian & Alaska Native share is much higher than both the state (15.2%) and national averages (1.1%).

Explore More:Population Over TimeBy Age & GenderBy RaceBy GenderNativity & Citizenship

Source: U.S. Census 2020 Demographics & Housing Characteristics (DHC) and U.S. Census 2011-2024 American Community Survey (ACS) 5-Year Estimates.
2020 Population:216Source: Census DHC
2024 ACS Population Estimate:162Source: Census ACS
2026 ZC Population Estimate:0Source: ZIP-Codes.com
Population Density:13.6 people per sq mile
Average Income:$30,000Source: Census ACS
Households:95Source: Census DHC
Average House Value:$666,666,666Source: Census ACS
Persons Per Household:2.27Source: Census DHC
Average Family Size:3.85Source: Census ACS

Population Over Time (with 2010 & 2020 Census Benchmarks)


Group201020112102201320142015201620172018201920202021202220232024
Census ACS Population Estimate--221243229268249302290249231217174155186162
Decennial Census218------------------216--------
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP05. DEMOGRAPHIC AND HOUSING ESTIMATES

Population by Age & Gender (Total, Male, Female)


Median Age: 38

Male Median Age: 40.3

Female Median Age: 28.5

Group< 55-910-1415-1920-2425-2930-3435-3940-4445-4950-5455-5960-6465-6970-7475-7980-8485+
Male116637998465711154332
Female78841586042871332011
Total1814147221715888131424186343
Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

Population by Race


White:2210.48%
Black:00%
Hispanic:*62.86%
Asian:20.95%
American Indian:17884.76%
Hawaiian:20.95%
Other:00%
Total:210100%
Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)
* NOTE: Hispanic or Latino is an ethnicity, not a race. This means individuals who identify as Hispanic will also be included in one of the race categories (such as White or Black). As a result, the totals shown here may exceed 100% when Hispanic is displayed alongside racial groups.

Gender Breakdown


GenderCount%Median Age
Males:11955.09%40.3 years
Females:9744.91%28.5 years
Total:216100%38.0 years
Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

Nativity & Citizenship


Native, born in the United States:16098.77%
Native, born in PR, Island Areas, or abroad:00.00%
Foreign born, naturalized U.S. citizen:00.00%
Foreign born, not a U.S. citizen:21.23%
Total Population:162100%
Total Native Population:16098.77%
Total Foreign-born Population:21.23%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS
Note: Nativity and Citizenship derived from American Community Survey (ACS) 5-year estimates. Total Population listed here will not match official ZIP Code population totals, which are based on the Decennial Census.

Income & Employment


In 2024, the Median household income is $30,000, which is well under the national median ($80,734), is down $20,179 (40.2%) since 2011 and below its 2019 pre-pandemic level by $6,250. Family households earn a median of $28,984 versus $23,750 for nonfamily households (a difference of $5,234). By gender, male median income is $68,750 and female is $50,938, which is considerably lower than the national female median ($55,274), with a current gap of $17,812 that has widened from 2011 to 2024. The labor-force participation rate is 58.2%, which is falls short of the national rate (63.5%). The unemployment rate is 26.8%, which is far worse than the national rate (5.2%). The largest occupation group is Sales (38.5%).

Explore More:Income Over TimeHousehold IncomeEmployment StatusBy Occupation

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Tables DP02, DP03, DP04 and DP05.

Median Income Over Time (Household, Family, Nonfamily, Male, Female)


Income Type20112012201320142015201620172018201920202021202220232024
Median Household Income$50,179$53,125$41,000$42,500$33,750$36,667$29,063$31,563$36,250$35,313$34,167$40,156$31,250$30,000
Median Family Income$58,214$61,250$61,000$60,208$63,125$63,125$0$37,500$43,250$26,250$0$0$0$28,984
Median NonFamily Income$18,750$18,750$18,000$17,813$15,833$16,250$15,781$14,688$16,125$16,250$17,917$0$16,875$23,750
Median Male Income$38,438$47,500$40,938$46,250$41,071$40,694$43,750$48,750$51,250$50,833$53,125$61,250$65,750$68,750
Median Female Income$68,333$63,750$44,375$46,250$46,250$61,042$64,375$64,500$63,750$62,188$64,375$75,938$78,125$50,938
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Average Household Income


Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Employment Status


Employed:5242.62%
Unemployed:1915.57%
Not In Labor Force:5141.80%
Total:122100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Employment by Occupation (Civilian Employed Population, 16 and Over)


Management, business, science, and arts:1630.77%
Service:35.77%
Sales and Office:2038.46%
Natural resources, construction, and maintenance:917.31%
Production, transportation, and material moving:47.69%
Total Civilian Employed Population:52100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS.

Housing & Affordability


In 2024, the median home value is $0, which is much lower than the national median ($332,700), is down $69,000 (100.00%) since 2011 and below its 2019 pre-pandemic level by $86,700. The median gross rent is $0, which is well under the national median ($1,413), and below its 2019 pre-pandemic level by $925. Of occupied housing, owners make up 67.44% (10.34% with a mortgage, 89.66% free-and-clear) and renters 32.56% - making this ZIP Code under national rental averages. The vacancy rate is 43.79%, which is much higher than the national rate (10.12%).

Explore More:Compare Home ValueHome Value Over TimeRent & Over TimeHousing Occupancy

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Table DP03, SELECTED ECONOMIC CHARACTERISTICS.

Median Home Value (Comparison)


Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Median Home Value Over Time


Group20112102201320142015201620172018201920202021202220232024
Median Home Value$69,000$81,700$65,800$73,500$76,200$76,300$78,200$78,700$86,700$110,400$160,400$122,900$95,000$0
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Gross Rent Paid


Less than $500:00.00%
$500 to $999:1657.14%
$1,000 to $1,499:27.14%
$1,500 to $1,999:00.00%
$2,000 to $2,499:00.00%
$2,500 to $2,999:00.00%
$3,000 or more:00.00%
No Rent:1035.71%
Total:28100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Median Gross Rent Over Time


Group20112102201320142015201620172018201920202021202220232024
Median Rent$0$1,325$950$675$692$725$1,042$1,083$925$863$797$888$863$0
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Housing Occupancy


Owner Occupied (with mortgage):66.98%
Owner Occupied (free and clear, no mortgage):5260.47%
Renter Occupied:2832.56%
Total Occupied Housing Units:86100%

Occupied Housing Units:8656.21%
Vacant Housing Units (not graphed):6743.79%
Total Housing Units:153100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Housing Type (Single-Family, Multi-Family, Other)


Single-Family Units:15198.69%
Multi-Family Units:21.31%
Other Units:00.00%
Total Housing Units:153100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Education, Health & Community


In 2024, 10.10% of adults (25+) have a bachelor's degree or higher, which is far lower than the national rate (35.70%). High school or higher is 87.90%, which is comparable to the national rate (89.60%). The uninsured rate is 14.80%, which is comparable to the national rate (8.40%). Private coverage is 9.90%, which is far lower than the national rate (67.10%). Public coverage is 82.10%, which is far higher than the national rate (36.70%). The share of people in poverty is 65.10%, which is far higher than the national rate (8.80%), up 39.20 percentage points since 2011 and above its 2019 pre-pandemic level by 30.40 percentage points. This signals a sharp increase in hardship - a shrinking consumer base, heavy pressure on public services, and job-market contraction risks. Among residents ages 3+, the largest enrollment group is elementary (86.21%). College enrollment is 0.00%, which is comparable to the national rate (26.70%), meaning the community mirrors broader higher-education participation.

Explore More:Educational AttainmentHealth InsurancePoverty Over TimeSchool Enrollment

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Tables DP02 and DP03.

Educational Attainment of Adults (25 and Older)


Less than 9th grade:22.02%
9th to 12th grade, no diploma:1010.10%
High school graduate (includes equivalency):5757.58%
Some college, no degree:1818.18%
Associate's degree:22.02%
Bachelor's degree:1010.10%
Graduate or professional degree:00.00%
Total:99100%
High school or higher:8787.88%
Bachelor's degree or higher:1010.10%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Health Insurance Coverage by Type (Private, Public, Uninsured)


Private Insurance:169.25%
Public Insurance:13376.88%
No Insurance:2413.87%
Total:173100%
Has Health Insurance:14986.13%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Percentage of People in Poverty Over Time (2011-2024)


Group20112102201320142015201620172018201920202021202220232024
% of People in Poverty17.9%14.8%19.4%21.5%14.5%15.9%17.3%22.9%26.7%42.1%44.4%41.5%57.1%65.1%
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Note: Counts of Families & People in poverty are not published at the ZIP Code level due to small sample sizes. Percentages shown are survey estimates from the American Community Survey (ACS). They may differ from official poverty statistics. The U.S. Census Bureau defines poverty status by comparing a family's or individual's total income with federal poverty thresholds that vary by family size and composition.

School Enrollment by Education Level (Ages 3 and Older)


Nursery School, Preschool:26.90%
Kindergarten:26.90%
Elementary school (grades 1-8):2586.21%
High school (grades 9-12):00.00%
College or graduate school:00.00%
Total:29100%
Early Childhood:413.79%
K-12 (Primary & Secondary School):2793.10%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Business & Employment Statistics


ZIP Code 99643 supports both business and residential activity. According to the Business Census (2024), there are 6 business establishments, employing about 12 people with an annual payroll of $937,000.

# Residential Mailboxes:0Source: USPS
# Business Mailboxes:0Source: USPS
Total Delivery Receptacles:1Source: USPS
Single Family Delivery Units:0Source: USPS
Multi Family Delivery Units:0Source: USPS
# of Businesses:6Source: CBP
1st Quarter Payroll:$148,000Source: CBP
Annual Payroll:$937,000Source: CBP
# of Employees:12Source: CBP

Geography, Land Area, & Statistical Classifications


ZIP Code 99643 is located in Kodiak Island Borough, Alaska, within the Metropolitan Statistical Area (CBSA ) and Alaska's 0th Congressional District. This area has a population of 0 people, about 0.00% of whom live in ZIP Code 99643. It covers 15.926 sq mi of land and a water area of 6.397 sq mi.

CBSA Name:--Source: Census
CBSA Number:--Source: Census
CBSA Type:--Source: Census
CBSA Division:--Source: Census
CBSA Population:0Source: Census
MSA:Source: Census
Land Area:15.926 sq miSource: Census
Water Area:6.397 sq miSource: Census
Congressional District:00Source: USPS
Congressional Land Area:571951.26 sq miSource: Census
PMSA:Source: Census
Intro Date:< 2004-10Source: ZIP-Codes.com
Place FIPS Code:0257340Source: Census
Place Name:Old Harbor city; AlaskaSource: Census

Adjacent & Nearby ZIP Codes


99644 | | 99641

Schools in ZIP Code 99643


ZIP Code 99643 is in the Kodiak Island Borough School District, which serves grades Pre-Kindergarten thru 12th. There are 1 public school(s) in this ZIP Code, and we have located 1 private school(s).

Old Harbor School Main St
Old Harbor, AK 99643
District: Kodiak Island Borough School District
Bristol Bay Christian Learning Center 1317 Lynx Loop
Naknek, AK 99633
District: Private SchoolNearby

Sources & References


Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on March 1, 2026.

  1. U.S. Postal Service [Last Updated: 3/1/2026], https://www.usps.com
  2. ZIP-Codes.com Proprietary Data Enhancements [Updated: 3/1/2026], https://www.zip-codes.com
  3. U.S. Census [Updated: Varies], https://www.census.gov
    • U.S. Census Office of Management and Budget [Updated: As Released]
    • U.S. Census 2020 Demographic & Housing Characteristics (DHC) [Decennial] [Updated: 5/25/2023]
    • U.S. Census 2011-2024 American Community Survey 5-year estimates (ACS) [Annually] [Updated: Annually, As Released]
    • U.S. Census Business Patterns (CBD) [Annually] [Updated: Annually, As Released]
    • U.S. Census American National Standards Institute (ANSI) [Updated: As Released]
  4. U.S. Geological Survey [Updated: Varies], https://www.usgs.gov
  5. Centers for Medicare & Medicaid Services [Updated: Annually, As Released], https://www.cms.gov
  6. National Center for Education Statistics [Updated: 3/1/2026], https://nces.ed.gov